The ISO3 country code that you want data
about.
(http://unstats.un.org/unsd/methods/m49/m49alpha.htm) or
the basin ID [1-468]. The historical period for country
is 1901 - 2009, and 1960 - 2009 for basin
cvar
The climate variable you're interested in.
"pr" for precipitation, "tas" for
temperature in celcius.
time_scale
The time scale you want to return
values on. Must be "month", "year" or
"decade"
Value
a dataframe with historical climate data
Details
The time_scale parameter returns a different number of
variables depending on the input timescale. Month
will return 12 values, a historical average for that month
across all years. Year will return yearly averages
for each year, and decade will return decade
averages.